The phrase "modification work" means making changes or adjustments to something.
Sentences with «modification work»
We also placed kittens in foster homes for behavior modification work, medical care, and crisis foster care. (arl-iowa.org)
In my veterinary clinical experience, combination therapy with behavioral modifications work best for aggression and anxiety in dogs and cats. (blog.nhvnaturalpetproducts.com)
And I'm glad to hear the fat - free modifications worked out! (connoisseurusveg.com)